Furnace



(No Model.)

J. DVIES. FURNAB. No. 503,40?. y Patented Aug. 15, 1893.

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UNITED STATES 'PATENT OFFICE.

JOSEPH DAVIES, OF BRIDGEPORT, PENNSYLVANIA.

FU RNACE.

SPECIFICATION forming part of Letters Patent No. 503,407, dated August 15, 1893.

Application filed January 10, 1893. Serial No. 457,919. (No model.)

To all whom t may concern.-

Be it known that I, JOSEPH DAVIES, a citizen of the United States, and a resident of Bridgeport, Montgomery county, Pennsylvania, have invented certain Improvements in Furnaces, of which the following is a specication.

The object of my invention is to aid the combustion of fuel in a steam boiler furnace or other furnace. This object I attain in the following manner, reference being had to the accompanying drawings, in Which- Figure l, is a longitudinal sectional View of a steam boiler furnace illustrating my improvement. Fig. 2, is a transverse sectional View on the line l-2, Fig. l. Fig. 3, is a de tached perspective View ofthe steam j et pipe.

A is the body of the furnace.

B is the fire boX, C the ash pit, and ZJ the grate bars.

D is the bridge wall separating the fire box from the combustion chamber E. In the present instance the boiler F is of the return tube type, the products of combustion passing through the chamber and through the tubes in the boiler, then over the boiler to the stack.

Between the bridge wall D and the back wall a of the furnace, I mount a series Of plates G, preferably of cast iron, separating the chamber into two sections, the lower section being what I term a hot air passage H; the upper section being the combustion chamber. These plates extend from one side Wall d to the other, and rest upon suitable shelving or brackets. The bridge wall D is hollow, forming a chamber d; and passages CZ', (Z2 form communicationsrespectively with the hot air chamber, Or passage H, and the ash pit C, so that the air heated in the passage 1I, and in the bridge wall, will pass into the ash pit between the grate bars, and aid the combustion of the furnace.

I mount Within the combustion chamber a pipe I connected with the steam space of the boiler at one end, and attached at the other end to a pipe fi, which is connected to a pipe t', having a series of openings or nozzles through which the steam escapes into the passage II. This pipe t" extends into the air opening 7L communicating with the said passage H, and by regulating the flow of steam through the pipe, which steam is superheated and at times decomposed, the passage of air to the ash-pit is accellerated, and the superheated and decomposed steam mingles with the air which is heated (coming in contact with the partition plates G) and enters the ash pit in the proper proportion to aid considerably the combustion of the fuel in the furnace. I preferably incline the partition G so as to not only allow sufficient space for the products of combustion, but also to increase the diameter of the passage as it nears the bridge wall.

I claim as my invention-4- 1. The combination of the fire box, the ash pit, the bridge Wall, said bridge Wall being hollow forming a chamber therein, the combustion chamber beyond the bridge wall, a boiler mounted above the combustion chamber, a plate or plates ext-ending across the combustion chamber forming a hot air passage the full width of the furnace, an air inlet through said passage, passages communieating with the chamber and bridge wall, and passages forming communication between the said chamber and the ash pit, a steam pipe in the combustion chamber connected to the steam space of the boiler, a nozzle attached to said steam pipe, and situated in the inlet of the air passage, substantially as described.

2. The combination of the fire box, the ash pit, the bridge wall, the combustion chamber beyond the bridge Wall, and air passage below the combustion chamber, plates G separating said air passage from the combustion chamber, said plates being inclined from the bridge wall to the back of the furnace, an air inlet in the back of the furnace communicating with said passage, a passage through the bridge wall forming a communication between the passage H and the ash-pit, a steam pipe in the combustion chamber communieating with the steam generator, a nozzle attached to said pipe and entering the air inlet to the passage H, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOSEPH DAVIES.

Witnesses: y

GEO. M. JOHNSON, W. L. STAUFEER. 

